Split pulley.



No. "5,634. Patented Dec. 9, I902.

' .L'W. BERRY.

v SPLIT PULLEY.

(Application filed June 19, 1908.)

(N0 llndol.)

w i/cnesses:

Tu: Nana's PETERS co, vuo'raumm. WASHlNGTON, o. c

UNITED STATES PATENT OFFICE.

JOHN WILLIAM BERRY, OF TACOMA, WASHINGTON.

SPLIT PU LLEY.

SPECIFICATION forming part of Letters Patent No. 715,634, dated December.1902- Application filed June 19, 1902. Serial No. 112,386. (No model.)

To all whom it may concern:

Be it known that 1, JOHN WILLIAM BERRY, a citizen of the United States,residingat Tacoma, in the county of Pierce and State of Washington, haveinvented certain new and useful Improvements in Split Pulleys; and I dodeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,which form a part of this specification.

This invention relates to certain new and useful improvements in splitpulleys; and it relates more particularly to that class of pulleys thesections of which are constructed of hard wood; and the invention hasfor its object, among others, the provision of means whereby the pulleymay be at all times retained in form.

It is well known that split pulleys as ordinarily constructed have beenfound to be defective by reason of the fact that the great strainimparted to the pulley from the belt frequently causes the rim of thepulley to become loosened and the semicircular rims to spread, thuscausing the wheel to become flattened and out of circle, which is aserious defect for pulleys,as the strain upon the arms under theseconditions becomes Very severe and the pulley is liable to go to pieces.

The essential object of the present invention resides in the provisionof strengthening-arms arranged in parallel relationship upon oppositesides of the clutch-block encircling and engaging the shaft, wherebyvthe semicircular rims of the pulley are stayed,and the extreme ends ofeach half of the pulley are securely tied and caused to maintain a rigidand true semicircle.

To these ends and to such others as the invention may pertain the someconsists in the peculiar construction and in the novel combination,arrangement, and adaptation of parts, as will be more fully describedhereinafter,shown in the accompanying drawings, and then specificallydefined in the appended claim.

The invention is clearly illustrated in the accompanying drawings,which, with the letters of reference marked thereon, form a part of thisspecification, and in which draw Ings Figure 1 is a side View of a splitpulley constructed in accordance with my invention. Fig. 2 is an edgeview of the pulley with onefourth of the wheel removed and showing theinterior arm and rim in elevation; and Fig. 3 is an edge view of thepulley, a portion of the wheel being shown in section.

Reference now being had to the details of the drawings by letter, B andB represent the two sections of the pulley-rim, and A and A the arms,each being framed into its respective semicircular half-.rimB and B, andserve to anchor or secure the ends of said sectional rims. These armsare recessed or notched to receive the clutch-blocks O and O, whichengage the shaft D. The two parts gether and to the shaft by means ofbolts E. The pulley is fixed on the shaft and prevented from turningthereon by means of any of the common forms of keys or set-screws; butany other means suited to the purpose may be substituted therefor, thesefeatures forming no part of the present invention. The construction ofthe pulley as heretofore described is the construction common in splitpulleys heretofore used.

The present invention resides in the provision, in connection with thepulley, of one or more segmental tie-rods F and F, said rods connectingthe semicircular rims at points adjacent to their connecting ends, wherethey serve to tie securely together the extreme ends of each half of thepulley and cause the same to maintain a rigid and true semicircle. Thesetierods, it will be observed, will serve to relieve the arms A and Afrom all tensile strain and at the same time to bind the outer ends ofeach semicircular rim firmly to its respective arm. By this constructionI am enabled to make a useful split pulley that will keep the form of atrue semicircle without imparting tensile strain to the arms of thepulley, and thus to prevent the possibility of the pulley-sectionsflying to pieces.

It will be observed that the nuts on the or halves of the split pulleyare bolted toends of the tie-rods are-set in sockets in the face of thepulley-rims and that such socketsare smoothly filled with plugs, asshown at G in Fig. 3 of the drawings, and it will also be seen that thenuts upon the opposite ends of each rod are cut with right and leftthreads, respectively. Should the rods at any time become loose, theymay be readily tightened by the use of an ordinary pipe-wrench.

By the construction described the arms A and A Will at all times be freefrom strain, except, of course, the rotary strain of the shaft andpulley, and should it be necessary at any time in tightening the rims Band B to spring the arms A and A out of line the strength or form of thepulley will not be af-, fected thereby, as it would be were it not forthe presence of the stay-rods.

Having thus fully described my invention,

jacent faces of said arms, and bolts passing 0 through the cross-armsand blocks,as set forth. In testimony whereof I hereunto affix mysignature in presence of two Witnesses.

JOHN WILLIAM BERRY.

\Nitnesses:

EDWARD A. SPAULDING, ASABEL NoR'roN FITCH.

